We found one dictionary that defines the word fall flat its face:

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1. fall flat its face: Idioms

▸ Words similar to fall flat its face ▸ Usage examples for fall flat its face ▸ Idioms related to fall flat its face ▸ Wikipedia articles (New!) ▸ Words that often appear near fall flat its face ▸ Rhymes of fall flat its face ▸ Invented words related to fall flat its face